login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A058693 Number of nonisomorphic matroids of rank 3 on n labeled points. 2
1, 4, 13, 38, 108, 325, 1275, 10037, 298491, 31899134 (list; graph; refs; listen; history; text; internal format)
OFFSET
3,2
LINKS
W. M. B. Dukes, Tables of matroids.
W. M. B. Dukes, Counting and Probability in Matroid Theory, Ph.D. Thesis, Trinity College, Dublin, 2000.
W. M. B. Dukes, The number of matroids on a finite set, arXiv:math/0411557 [math.CO], 2004.
W. M. B. Dukes, On the number of matroids on a finite set, Séminaire Lotharingien de Combinatoire 51 (2004), Article B51g.
Markus Kirchweger, Manfred Scheucher, and Stefan Szeider, A SAT Attack on Rota's Basis Conjecture, Leibniz International Proceedings in Informatics (LIPIcs 2022) Vol. 236, 4:1-4:18.
Yoshitake Matsumoto, Database of Matroids
Dillon Mayhew and Gordon F. Royle, Matroids with nine elements, arXiv:math/0702316 [math.CO], 2007 (see p. 7).
Dillon Mayhew and Gordon F. Royle, Matroids with nine elements, J. Combin. Theory Ser. B 98(2) (2008), 415-431.
CROSSREFS
Column k=3 of A053534.
Sequence in context: A056014 A247287 A159036 * A027076 A183112 A364647
KEYWORD
nonn,more
AUTHOR
N. J. A. Sloane, Dec 30 2000
EXTENSIONS
a(9) from Petros Hadjicostas, Oct 10 2019 using the papers of Mayhew and Royle
a(10)-a(11) from Manfred Scheucher, Sep 02 2020
a(12) from Database of Matroids added by Andrey Zabolotskiy, Mar 26 2023
STATUS
approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified March 19 01:22 EDT 2024. Contains 370952 sequences. (Running on oeis4.)